Magnetostrictive liquid level meter

Abstract

The utility model discloses a magnetostrictive liquid level meter which comprises a probe rod, a titanium alloy floater, an electronic bin and an installation piece. The titanium alloy floater is slidably mounted on the probe rod, the electronic bin and the probe rod are fixedly mounted, the probe rod partially extends into to-be-mounted equipment and is fixedly mounted with the to-be-mounted equipment through a mounting part, a waveguide wire is arranged in the probe rod, a circuit module is arranged in the electronic bin, and a magnet is arranged in the titanium alloy floater. The circuit module is connected with the waveguide wire to carry out electromagnetic excitation on the waveguide wire and detect strain pulses generated by the waveguide wire under magnetic field induction of the magnet. The floater of the magnetostrictive liquid level meter is made of the titanium alloy material, has light density and strong structural strength, can be made into a small size and has a wide density range, and the compatibility of the floater to the field working condition is stronger under the condition that the parameters such as pressure resistance and density of the floater are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of magnetostrictive sensing, and particularly relates to a magnetostrictive liquid level meter. BACKGROUND

[0002] The precision of the magnetostrictive liquid level sensor plays a vital role in the fields of aviation, military and industrial production. In recent years, with the continuous progress of science and technology, the rapid development of electronic technology, the unremitting research of scientific researchers, the gradual improvement of production technology, and the discovery and application of new magnetostrictive materials, the overall performance and detection precision of the magnetostrictive liquid level sensor have been continuously improved, and are developing towards the direction of large range, high precision, digitization and intelligence.

[0003] The magnetostrictive liquid level meter generally comprises a detection rod main body carrying a magnetostrictive material, a liquid level float with a permanent magnet, and a circuit part. An excitation pulse signal propagates forward along a waveguide wire and forms an excitation magnetic field around the waveguide wire. The excitation magnetic field propagates forward together with the excitation pulse signal. When the excitation magnetic field reaches the position of the permanent magnet, it is superimposed with a bias magnetic field formed at the position of the permanent magnet to form a spiral magnetic field. According to the Weideman effect, the spiral magnetic field exerts a force on the waveguide wire to cause deformation of the waveguide wire, so that a mechanical wave is generated at the permanent magnet. The mechanical wave propagates to both ends along the waveguide wire, and is converted into an electrical signal and outputs data at the sound speed.

[0004] At present, most conventional liquid level meters adopt a mounting mode of threads or mounting plates, and generally have problems of large volume, inconvenient installation, poor sealing performance, etc. At the same time, when installing, the detection rod with the float needs to be inserted into the liquid storage tank through the mounting hole on the liquid storage tank. Due to the requirement of buoyancy, the size of the float of most liquid level meters on the market is usually large, so a larger mounting hole is also required on the liquid storage tank. Because the space of industrial equipment is becoming more and more compact, the conventional liquid level meter cannot be installed in some narrow use scenarios.

[0005] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the overall background of the utility model, and should not be regarded as acknowledging or implying in any form that this information constitutes prior art known to those of ordinary skill in the art. CONTENT OF THE UTILITY MODEL

[0006] The utility model aims to provide a magnetostrictive liquid level meter which can adapt to narrow installation environment and is convenient to install.

[0007] In order to achieve the above-mentioned purpose, the technical scheme provided by the utility model in one specific embodiment is as follows:

[0008] The utility model provides a magnetostrictive liquid level meter, including probe rod, titanium alloy float, electronic warehouse and mounting piece, titanium alloy float is slidably installed on the probe rod, electronic warehouse is fixedly installed with the probe rod, the probe rod part goes into the equipment to be installed and is fixedly installed with the equipment to be installed through the mounting piece, is provided with waveguide silk in the probe rod, is provided with circuit module in the electronic warehouse, is provided with magnet in the titanium alloy float, circuit module links to each other with waveguide silk to carry out electromagnetic excitation to waveguide silk and detects the strain pulse that waveguide silk produces under the magnetic field induction of magnet.

[0009] In one or more embodiments of the utility model, the part of the probe rod located outside the equipment to be installed extends radially to form an abutting portion, and the abutting portion abuts against the equipment to be installed.

[0010] In one or more embodiments of the utility model, the magnetostrictive liquid level meter further comprises a gasket, and the gasket is arranged between the abutting portion and the equipment to be installed.

[0011] In one or more embodiments of the utility model, a protrusion for extruding the gasket is arranged on the abutting portion.

[0012] In one or more embodiments of the utility model, the protrusion is arranged around the periphery of the abutting portion.

[0013] In one or more embodiments of the utility model, the mounting piece comprises a mounting portion and a fixing portion connected to each other, the abutting portion is fixed between the fixing portion and the equipment to be installed, and the mounting portion is fixedly installed with the equipment to be installed.

[0014] In one or more embodiments of the utility model, an inner thread for cooperating with the equipment to be installed is arranged on the inner wall of the mounting portion.

[0015] In one or more embodiments of the utility model, a limiting portion for installing the magnet is arranged in the titanium alloy float.

[0016] In one or more embodiments of the utility model, the magnetostrictive liquid level meter further comprises a controller, and the controller is connected to the circuit module to control the circuit module.

[0017] In one or more embodiments of the utility model, a display screen is arranged on the controller, and / or a connector for connecting an external device is arranged on the controller.

[0018] Compared with the prior art, the float of the magnetostrictive liquid level meter adopts titanium alloy material, has lighter density and strong structural strength, can be made to smaller size while having a wider density range, and ensures stronger compatibility of the float to the field working condition under the conditions of pressure resistance, density and other parameters.

[0019] In addition, the installation is performed through the mounting piece, and a gasket is arranged between the probe rod and the equipment to be installed, so as to ensure the sealing between the magnetostrictive liquid level meter and the equipment to be installed. The sealing performance is further improved by arranging the protruding structure on the probe rod abutting portion, so that the liquid level meter has more abundant use scenarios.

[0020] The magnetostrictive liquid level meter also adopts a split design, separates the controller from the electronic bin, retains the signal acquisition and processing function of the probe rod part, ensures the integrity and reliability of long-distance signal transmission, and can also reduce the size of the probe rod part, facilitating use and installation. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0022] Figure 1 It is the overall structure diagram of the magnetostrictive liquid level meter in an embodiment of the present application.

[0023] Figure 2 It is the partial sectional view of the magnetostrictive liquid level meter in an embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the person skilled in the art better understand the technical scheme in the present application, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor should belong to the scope of protection of the present application.

[0025] "connected" or "coupled" in the specification include both direct connection and indirect connection through an intermediate medium. The indirect connection through an intermediate medium is, for example, a connection through an electrically conductive medium such as a wire, which can have a parasitic inductance or a parasitic capacitance, or a connection through other active or passive devices, such as a connection through a switch, a follower circuit, or the like. In addition, in the specification, words such as "first", "second", and the like are mainly used to distinguish one technical feature from another technical feature, and do not necessarily require or imply that there is a certain actual relationship, quantity, or order between the technical features.

[0026] In the detailed description of the specification, reference is made to the accompanying drawings that form a part hereof, in which like reference numerals refer to like parts throughout the several views and in which an exemplary embodiment is shown by way of illustration. It is to be understood that other embodiments can be utilized and structural or logical changes can be made without departing from the scope of the present disclosure. Therefore, the following detailed description is not to be taken in a limiting sense.

[0027] Various operations can be described as multiple discrete actions or operations in a manner that is most helpful in understanding the claimed subject matter. However, the order of description should not be construed as to imply that these operations are necessarily order dependent. In particular, these operations can not be performed in the order of presentation. Operations described can be performed in a different order than the described embodiment. Various additional operations can be performed and / or described operations can be omitted in additional embodiments.

[0028] For the purposes of this disclosure, the phrase "A and / or B" means (A), (B), or (A and B). For the purposes of this disclosure, the phrase "A, B, and / or C" means (A), (B), (C), (A and B), (A and C), (B and C), or (A, B and C).

[0029] Various components, devices, etc. can be referred to herein in singular form, but this is not intended to exclude plural arrangements. For example, a single component can be used in place of a plurality of components, or a plurality of components can be used in place of a single component. Similarly, various components, devices, etc. can be referred to herein in plural form, but this is not intended to exclude singular arrangements. For example, a single component can be used in place of a plurality of components, or a plurality of components can be used in place of a single component.

[0030] The specification describes use of the phrases "in an embodiment" or "in other embodiments" or "in some embodiments", which can each refer to one or more of the same or different embodiments. Furthermore, the terms "comprising", "containing", "having" and the like in the context of describing embodiments of the disclosure are synonymous.

[0031] As Figure 1As shown, a magnetostrictive liquid level gauge in an embodiment of the present invention includes a probe 10 , a titanium alloy float 20 , an electronic compartment 30 , a controller 40 and a mounting member 50 .

[0032] The titanium alloy float 20 is slidably mounted on the probe rod 10, and the electronics compartment 30 is fixedly mounted to the probe rod 10. The probe rod 10 partially extends into the device 90 to be installed and is fixed to the device 90 via the mounting member 50. A waveguide wire is disposed within the probe rod 10, and a circuit module is housed within the electronics compartment 30. A magnet is housed within the titanium alloy float 20. The circuit module is connected to the waveguide wire to electromagnetically excite the waveguide wire and detect strain pulses induced by the magnetic field of the magnet. A controller 40 is connected to the circuit module to control it.

[0033] In one embodiment, the electronic chamber 30 is fixedly mounted on the top of the probe rod 10. The probe rod can be inserted into the device 90 to be installed (such as a liquid storage tank) through a mounting hole on the device to be installed 90 and immersed in the liquid to be measured. The titanium alloy float 20 can float on the surface of the liquid. The circuit module includes a current pulse generator and a pulse detection circuit. During measurement, the current pulse generator electromagnetically excites the waveguide wire, generating a current pulse on the waveguide wire. The current pulse forms a circular magnetic field along the axial direction of the waveguide wire. The circular magnetic field propagates downward along the waveguide wire. When the propagating magnetic field encounters the magnetic field formed by the magnet in the float, the two magnetic fields superimpose on each other, causing the waveguide wire to deform instantaneously, generating a strain pulse. The strain pulse propagates to both ends of the waveguide wire. When it reaches the electronic chamber 30 at the top of the probe rod, it is received by the pulse detection circuit. The distance between the electronic chamber 30 and the float is calculated by multiplying the current pulse generation time and the strain pulse reception time by the strain pulse propagation speed. Based on this magnetostrictive principle, the liquid level can be determined.

[0034] An aviation socket connected to the circuit module is installed on the electronic compartment 30. The controller 40 is connected to the aviation socket on the electronic compartment 30 via a wire. The controller 40 can control the circuit module to perform electromagnetic excitation, and the circuit module then sends the detected strain pulse signal to the controller 40.

[0035] In one embodiment, the controller 40 is further provided with a display screen 41 and a connector 42 for connecting to external devices. The controller 40 can further process and calculate the strain pulse signal to obtain liquid level information and transmit the liquid level information to the outside world through display, data transmission, etc.

[0036] In one embodiment, the titanium alloy float 20 is internally provided with a retaining portion for mounting a magnet. The magnet and retaining portion can be secured by gluing, for example, WB1001 glue, which has good fixation after solidification and is suitable for use at room temperatures, or by using a lipid-based glue, which has good high-temperature resistance and is suitable for use in high-temperature environments.

[0037] As shown in Figure 2 The part of the probe rod 10 located outside the device to be installed 90 extends radially to form an abutting portion 11, which abuts against the device to be installed 90.

[0038] The mounting member 50 comprises a mounting portion 51 and a fixing portion 52 connected together, the abutting portion 11 is fixed between the fixing portion 52 and the device to be installed 90, and the mounting portion 51 is fixedly mounted with the device to be installed 90.

[0039] In an embodiment, the inner wall of the mounting portion 51 is provided with an internal thread for cooperating with the device to be installed 90. In other embodiments, the mounting portion 51 and the device to be installed 90 can also be connected by snap connection, sealing glue, welding or other installation methods.

[0040] In an embodiment, the fixing portion 52 is annular, and the mounting portion 51 is connected with the outer periphery of the fixing portion 52. The mounting portion 51 and the fixing portion 52 can be integrally formed. Since the fixing portion 52 is annular and has a through hole in the center, the mounting member 50 can be pre-fitted on the probe rod 10, and then the probe rod 10 is inserted into the device to be installed 90, and the mounting member 50 is tightened to realize the fixed installation of the liquid level meter. In other embodiments, the mounting portion 51 and the fixing portion 52 can also have other shapes.

[0041] As shown in Figure 2 The magnetostrictive liquid level meter further comprises a gasket 12, which is arranged between the abutting portion 11 and the device to be installed 90.

[0042] During installation, the gasket 12 is extruded by the abutting portion 11 and the device to be installed 90, so that the gasket 12 and the abutting portion 11, and the gasket 12 and the device to be installed 90 are realized as face seals, ensuring that the probe rod 10 has good airtightness after installation.

[0043] Further, the abutting portion 11 is provided with a protrusion 13 for extruding the gasket 12. The gasket 12 is extruded by the protrusion 13 and is slightly deformed under stress, so that the connection is further sealed.

[0044] Preferably, the protrusion 13 is arranged around the periphery of the abutting portion 11. At this time, the sealing surface formed by the combination of the protrusion 13 and the slightly deformed gasket 12 can surround the mounting hole on the device to be installed 90, avoiding the occurrence of leakage points.

[0045] Preferably, the gasket 12 is an EP grade 316L gasket.

[0046] In practical application, the probe rod 10 can be first inserted into the device to be installed 90 through the mounting hole on the device to be installed 90, and then the mounting piece 50 is tightened to complete the installation. Through the optimization design of the float, the mounting structure and the like, the magnetostrictive liquid level gauge has a smaller size, can be adapted to the device with a standard 3 / 4" interface, and is convenient to install.

[0047] Since the float is made of titanium alloy material, it has lighter density and stronger structural strength, and can be made to a smaller size while having a larger density range. When the size of the float is made to φ7*d16.2*h40, the density of the float can reach 0.64g / cm 3 At this time, the float can pass through the standard 3 / 4" interface (the inner diameter is 16.5mm), and can float in the commonly used medium, including but not limited to water, hydrofluoric acid, ammonia water, methanol, ketone, ether and the like, and the medium density is from 0.67g / cm 3 ~1.2g / cm 3 Different. Under the condition of ensuring the pressure resistance and density of the float, the compatibility of the on-site working condition is stronger.

[0048] At the same time, since the titanium alloy material does not have iron-nickel property, it will not cause the weakening of the external magnetic field due to the attraction with the internal magnet, thereby ensuring the measurement accuracy of the magnetostrictive liquid level gauge.

[0049] In addition, the magnetostrictive liquid level gauge is installed through the mounting piece 50 and a gasket 12 is arranged between the probe rod 10 and the device to be installed 90, so as to ensure the sealing between the magnetostrictive liquid level gauge and the device to be installed 90. The sealing performance is further improved by arranging the protrusion 13 structure on the abutting portion 11 of the probe rod 10. By adopting this installation structure, it has been verified that the use negative pressure is more than 1.5*10^(-10) mbar, so that the liquid level gauge has more rich use scenarios.

[0050] The magnetostrictive liquid level gauge also adopts a split type design, separates the controller 40 from the electronic bin 30, so that only the functions of pulse excitation, signal acquisition and processing are reserved in the electronic bin 30 and the probe rod 10 part, and the calculation, control, display and output functions are integrated in the controller 40, which not only ensures the integrity and reliability of the signal long-distance transmission, but also reduces the size of the probe rod 10 part, and is convenient to use and install.

[0051] It is apparent for a person skilled in the art that the present application is not limited to the details of the above-described exemplary embodiments, but that it can be implemented in other concrete forms without departing from the spirit or the essential characteristics of the present application. Therefore, the embodiments should be considered as exemplary and non-limiting, the scope of the present application being defined by the claims appended hereto rather than by the above description, and all the changes which fall within the meaning and the scope of the equivalent elements of the claims are intended to be embraced therein. Any reference signs in the claims should not be construed as limiting the claims to the figures in which the reference signs are used.

[0052] Furthermore, it should be understood that although the present specification describes exemplary embodiments, not every embodiment contains only one independent technical solution, and the present specification is described in this way only for the sake of clarity, and a person skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that a person skilled in the art can understand.

Claims

1. A magnetostrictive liquid level gauge, characterized in that: It includes a probe rod, a titanium alloy float, an electronic compartment and a mounting piece. The titanium alloy float is slidably mounted on the probe rod, the electronic compartment is fixedly mounted on the probe rod, the probe rod partially extends into the equipment to be installed and is fixedly mounted on the equipment to be installed through the mounting piece, a waveguide wire is arranged in the probe rod, a circuit module is arranged in the electronic compartment, a magnet is arranged in the titanium alloy float, and the circuit module is connected to the waveguide wire to electromagnetically excite the waveguide wire and detect the strain pulse generated by the magnetic field induction of the magnet on the waveguide wire.

2. The magnetostrictive liquid level gauge according to claim 1, characterized in that: The portion of the probe rod located outside the device to be installed extends radially to form an abutting portion, and the abutting portion abuts against the device to be installed.

3. The magnetostrictive liquid level gauge according to claim 2, characterized in that: The magnetostrictive liquid level gauge further includes a gasket, which is arranged between the abutting portion and the device to be installed.

4. The magnetostrictive liquid level gauge according to claim 3, characterized in that: The abutting portion is provided with a protrusion for pressing the gasket.

5. The magnetostrictive liquid level gauge according to claim 4, characterized in that: The protrusion is arranged around the periphery of the abutting portion.

6. The magnetostrictive liquid level gauge according to claim 2, characterized in that: The mounting member includes a mounting portion and a fixing portion connected to each other, the abutting portion is fixed between the fixing portion and the device to be mounted, and the mounting portion is fixedly mounted to the device to be mounted.

7. The magnetostrictive liquid level gauge according to claim 6, characterized in that: The inner wall of the mounting portion is provided with an internal thread for cooperating with the device to be mounted.

8. The magnetostrictive liquid level gauge according to claim 1, characterized in that: A limiting portion for installing the magnet is provided inside the titanium alloy float.

9. The magnetostrictive liquid level gauge according to claim 1, characterized in that: The magnetostrictive liquid level gauge further includes a controller, which is connected to the circuit module to control the circuit module.

10. The magnetostrictive liquid level gauge according to claim 9, characterized in that: The controller is provided with a display screen; and / or The controller is provided with a connector for connecting to external devices.

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